The Decade in Online Advertising 1994-2004 is a new 21 page PDF report from DoubleClick that offers a ton of data about online ad spend over the past 10 years. Check out the nice quarterly spend chart on page 4. Page 12 has a nice pie chart showing search at having 40 percent of online spend as of the second quarter of last year. A short history of search ads begins on page 11.
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.